A reader writes:

It is true that PTSD has wide prevalence. But PTSD as a disorder is really a consequence of its designation as such in the Diagnostic and Statistical Manual of Mental Disorders (DSM), the same manual that once classified homosexuality as a mental disorder.  As the attached paper (PDF) from a recent Psychiatric Annals suggests, PTSD my not be a disorder at all but rather a set of normal responses to traumatic events.  Indeed, the mere fact of these responses being classified as disorder might be deleterious to recovery.

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